Mounting base for rotary piston engine



Jan. 31, 1967 RYUSUKE ITO 3,301,230

MOUNTING BASE FOR ROTARY PISTON ENGINE Filed Dec. 2, 1964 FIG INVENTORpykSlAke Il IIBY ATTORNEYS United States Patent 3,301,230 MOUNTING BASEFOR ROTARY PISTON ENGINE Ryusuke Ito, Amagasaki-shi, Japan, assignor toYanmar Diesel Engine Co., Ltd., Osaka, Japan, a corporation of JapanFiled Dec. 2, 1964, Ser. No. 415,242 Claims priority, application Japan,Dec. 6, 1963, 38/ 91,171 2 Claims. (Cl. 123-8) This invention relates torotary piston engines of the well known type which incudes a casinghaving an epitrochoidal inner peripheral wall and a piston mounted insaid casing for planetary motion therein and having apex portions heldin sliding engagement with the timer peripheral wall of the casing. Withthis type of rotary piston engine, lubricating oil is customarily usednot only for lubrication of the interior mechanism of the engine butalso for cooling the piston, and it has thus been necessary to provide areservoir for lubricant oil and an oil cooler device, which has usuallybeen arranged independently from the oil reservoir. reduction in sizeand weight of the engine and to simplification of its construction.

To overcome this difl'iculty, the present invention proposes to providea mounting base for a rotary piston en gine of the type described, whichbase has an enclosed cavity formed therein to serve as an oil reservoir,partition walls formed in the cavity to define an oil passageway ofappropriate configuration therethrough and to serve as cooling fins, anda water jacket formed closely beneath the bottom wall of said oilreservoir to receive a flow of cooling water for cooling the oil flowingthrough said oil reservoir, said partition walls and water jackettogether forming an oil cooling means integral with the oil reser- V011.

The present invention will now be described with reference to theaccompanying drawings, in which:

FIG. 1 is a side elevation, partly in section, of an engine unitembodying the present invention;

FIG. 2 is a front elevation, partly in section of same;

FIG. 3 is a cross-sectional View substantially taken along the line AAin FIG. 1; and

FIG. 4 is a cross-sectional view substantially taken along the line BBin FIG. 1.

Referring to the drawings, and first to FIG. 1, the engine unit includesa rotary piston engine 1 and a mounting base 3 on which said engine 1 issecurely mounted. The mounting base has formed therein a cavity 7 toserve as an oil reservoir and a bottom chamber 9 separated from saidcavity by the bottom wall of said cavity serving as a partition wallbetween said cavity and chamber 9. The cavity 7 is provided with an oilinlet port 13, an oil outlet port 15 and a number of vertical partitionwalls 11 (FIGS. 1 and 3) defining an oil passageway of appropriateconfiguration, through which oil entering the cavity through the oilinlet port is directed to the oil outlet port at an appropriatee rate offlow. The oil reservoir cavity 7 is also provided with an oil fillingport 23 and an oil level This has formed an obstacle to 3,301,230Patented Jan. 31, 1967 lCC gauge 25, as illustrated. The bottom chamber9, serving as a water jacket, is provided with an inlet port 17 and anoutlet port 19 for cooling water and also provided with a number ofpartition walls 21 (FIGS. 1 and 4), which in the illustrated embodimentdefine parallel passageways for cooling water so that it may fiowuniformly through the chamber at an appropriate velocity depending uponthe rate of flow of the cooling water. It will be understood that thepartition walls 20 also serve as cooling fins.

It is to be noted that the oil flowing through the oil reservoir 7 iscooled by transferring its heat to the cooling water through the bottomwall 5 separating the oil reservoir from the water jacket and throughthe partition walls 11 and 21 formed in the oil reservoir 7 and waterjacket 9, respectively. It will be apparent that, if the bottom wall ofthe oil reservoir be exposed directly to water streams just like thebottom of a ship, the water jacket can be dispensed with. Alternatively,the Water jacket may take the form of an water-tight arrangemen ofcoolting water tubes in the oil reservoir, which affords a requiredtotal cooling area.

What is claimed is:

1. A mounting base for a rotary piston engine of the type including acasing having an epitrochoidal inner peripheral wall and a pistonmounted in said casing for planetary motion therein and having apexportions held in sliding engagement with the inner peripheral wall ofthe casing, said mounting base comprising a cavity formed therein andadapted to compose an oil reservoir, said cavity being provided withopenings respectively in communication with the lubricating oil inletand outlet ports of the engine, and a water-cooling means arrangedintegral with said oil reservoir for cooling the oil in the reservoir.

2. A mounting base for a rotary piston engine of the type including acasing having an epitrochoidal inner peripheral wall and a pistonmounted in said casing for planetary motion therein and having apexportions held in sliding engagement with the inner peripheral wall ofthe casing, said mounting vbase comprising a cavity formed therein andadapted to compose an oil reservoir, said cavity being provided withopenings respectively in communication with the lubricating oil inletand outlet ports of the engine, partition walls formed in said cavity todefine an oil passageway of appropriate configuration therethrough andto serve as cooling fins, and a water jacket formed closely beneath thebottom wall of said oil reservoir to receive a flow of cooling water forcooling the oil flowing through said oil reservoir, said partition wallsand water jacket together forming an oil cooling means integral withsaid oil reservoir.

References Cited by the Examiner UNITED STATES PATENTS 1,558,788 10/1925 Campbell. 1,989,585 1/1935 Bigelow 123196 2,365,166 12/1944 Bay123-196 X MARK NEWMAN, Primary Examiner.

F. T. SADLER, Assistant Examiner.

1. A MOUNTING BASE FOR A ROTARY PISTON ENGINE OF THE TYPE INCLUDING ACASING HAVING AN EPITROCHOIDAL INNER PERIPHERAL WALL AND A PISTONMOUNTED IN SAID CASING FOR PLANETARY MOTION THEREIN AND HAVING APEXPORTIONS HELD IN SLIDING ENGAGEMENT WITH THE INNER PERIPHERAL WALL OFTHE CASING, SAID MOUNTING BASE COMPRISING A CAVITY FORMED THEREIN ANDADAPTED TO COMPOSE AN OIL RESERVOIR, SAID CAVITY BEING PROVIDED WITHOPENINGS RESPECTIVELY IN COMMUNICATION WITH THE LUBRICATING OIL INLETAND OUTLET PORTS OF THE ENGINE, AND A WATER-COOLING MEANS ARRANGEDINTEGRAL WITH SAID OIL RESERVOIR FOR COOLING THE OIL IN THE RESERVOIR.